Finding the Third Proportional to 139,071 and 299,107.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,071 : 299,107.50 = 299,107.50 : x
2. Step 2: Convert to fraction form
   139,071/299,107.50 = 299,107.50/x
3. Step 3: Cross multiply
   139,071x = 299,107.50 × 299,107.50
4. Step 4: Simplify right side
   139,071x = 89,465,296,556.25
5. Step 5: Solve for x
   x = 89,465,296,556.25/139,071
6. Step 6: Final answer
   x = 643,306.63